Synchronization of prerecorded audio/video signals with multi-media controllers

ABSTRACT

A fuel dispenser having a controllable audio/video program display includes a fuel pump and delivery path, a program media display, and a prerecorded program and a multi-media controller to direct program signals to the program media display. Apparatus is included for recovering multi-media control signals embedded in the program signals in the prerecorded program including a detector for detecting predetermined portions of the program signals having embedded control signals and rerouting means for rerouting the control signals in the program signals to an output. The multi-media controller is coupled to the rerouting means to act on the program signals as directed to the media display.

BACKGROUND OF THE INVENTION

The present invention relates to improvements in multi-media systems anddisplays, typically including audio and visual components.

Multi-media systems are known as devices able to present informationfrom a variety of information sources, such as computer displays, videodisplays, synthesized music, pre-recorded audio, etc., in a synchronizedmanner. One of the general decisions to be made in multi-mediadevelopment is how to coordinate the various information sources inorder to form a coherent, and aesthetically pleasing format. Typicalprior art multi-media systems control and coordinate their variousinputs using a computer program. The computer, then, is in charge of"making decisions" as to what is to be included in a display. But, whenthe visual or audio programming to be played is recorded on a tape orvideo disk, the computer does not have data concerning the recordingunless it is separately supplied to the computer as another database orthe like. This adds to the cost and complexity of the system, since theseparate database must be created and manipulated. Accordingly, there isa need in the art for a multi-media control apparatus and methodologyfor controlling various inputs other than by a computer control.

SUMMARY OF THE INVENTION

The present invention fulfills this need in the art by providing anapparatus for encoding multi-media control signals into program signalsin an audio/video program including detector means for detectingpredetermined portions of the program signals and substitution means forsubstituting multi-media control signals into the program signals inplace of the predetermined portions of the program signals.

According to one aspect, the detector means may be a synchronizationseparator to separate start-of-frame signals from the video signals andthe substitution means may be a switching means for switching thecontrol signals into the video signals after a start-of-frame signal isdetected. The synchronization separator may also separate horizontalsynchronization signals from the video signal and the switching meansmay stop switching the control signals into the video signals when ahorizontal synchronization signal is detected. The substitution may takeplace immediately upon detection of the start-of-frame signal, or aftera predetermined delay, and may continue until either the first or asubsequent horizontal synchronization signal, as desired.

According to a preferred embodiment, the switching means includes alatch having the start of frame input from the synchronization separatoras one of a set and reset input and the horizontal synchronizationsignal as the other of a set and reset input and a switch having asignal routing controlled by the latch, whereby the switching meansstops switching the control signals into the video signals when ahorizontal synchronization signal is detected.

The apparatus preferably includes a control signal synchronizer tosynchronize the control signals with the video signal upon detection ofthe start-of-frame signal.

This aspect of the invention is particularly useful if the video signalis a composite video signal.

The apparatus may include a video cassette recorder (or other recordingdevice) coupled to the substitution means for recording the combinedmulti-media control signals and video signals.

The invention also provides a method of encoding multi-media controlsignals into program signals in an audio/video program includingdetecting predetermined portions of the program signals and substitutingmulti-media control signals into the program signals in place of thepredetermined program signals.

The detecting step may separate start-of-frame signals from the videosignals and the substituting step may switch the control signals intothe video signals after a start-of-frame signal is detected. Preferably,the separating step includes separating a horizontal synchronizationsignal from the video signal and the switching step terminates when ahorizontal synchronization signal is detected. The method preferablyfurther includes synchronizing the control signals with the video signalupon detection of the start-of-frame signal.

According to a preferred embodiment the separating step also separates ahorizontal synchronization signal from the video signal. The switchingstep may include one of setting a latch or resetting a latch when astart of frame is detected in the detecting step to output a signallevel from the latch and the other of setting or resetting the latchwhen a horizontal synchronization signal is detected in the detectingstep to halt outputting the signal level and routing the multi-mediacontrol signals to a common output when the latch outputs the signallevel and routing the video signal to the common output when the latchdoes not output the signal level.

The method may include recording the combined multi-media controlsignals and video signals on a video cassette recorder.

According to another aspect, the invention provides an apparatus forrecovering multi-media control signals embedded in video signals in avideo program. This apparatus includes a detector means for detectingportions of the video signals having embedded control signals andrerouting means for rerouting the control signals in the video signalsto an output adapted for attachment to a multi-media controller to acton the video signals as directed to a media display.

The detector means may be a synchronization separator to separatestart-of-frame signals from the video signals and the rerouting meansmay be a gate for routing the control signals to the output when astart-of-frame signal is detected. Preferably, the synchronizationseparator also separates a horizontal synchronization signal from thevideo signal and the gate stops routing the control signals to theoutput when a horizontal synchronization signal is detected. Thererouting may take place immediately upon detection of thestart-of-frame signal, or after a predetermined delay, and may continueuntil either the first or a subsequent horizontal synchronizationsignal, as desired.

This technique is particularly useful if the video signal is a compositevideo signal.

The apparatus preferably further includes a multi-media controllerhaving the output as a first input and the video signals as a secondinput and control means for controlling the output of video signals fromthe multi-media controller in response to the control signals.

According to another aspect, the invention provides a method forrecovering multi-media control signals embedded in video signals in avideo program. The method includes detecting portions of the videosignals having embedded control signals and rerouting the controlsignals in the video signals to an output adapted for attachment to amulti-media controller to act on the video signals as directed to amedia display. Preferably, the detecting step includes separatingstart-of-frame signals from the video signals and the rerouting stepincludes gating the control signals to the output after a start-of-framesignal is detected. Preferably, the method further includes separating ahorizontal synchronization signal from the video signal and terminatingthe rerouting when a horizontal synchronization signal is detected.

In a preferred embodiment the method further includes providing amulti-media controller having the control signals as a first input andvideo signals as a second input and controlling the output of videosignals from the multi-media controller in response to the controlsignals.

According to another aspect, the invention provides an apparatus forencoding multi-media control signals into audio signals in a program.This apparatus includes a control signal modulator for modulating thecontrol signals to a bandwidth of an audio signal, a filter for theaudio signals to delete portions of the audio signals in the bandwidth,and a summing circuit to sum the modulated control signal and thefiltered audio signal to form a combined control and audio signal.Typically, the audio signal has a bandwidth and the bandwidth in whichthe control signals are modulated is an upper part of the audiobandwidth.

The control signal modulator may modulate the control signals in amodulation mode selected from the group consisting of frequencymodulation, amplitude modulation and pulse modulation.

The apparatus may include a recorder to record the combined control andaudio signals.

According to another aspect, the invention provides a method forencoding multi-media control signals into audio signals in a program.The method includes modulating the control signals to a bandwidth of theaudio signal, filtering the audio signals to delete portions of theaudio signals in the bandwidth, and summing the modulated control signaland the filtered audio signal to form a combined control and audiosignal.

Typically, the audio signal has a limited bandwidth, and the bandwidthin which the control signals are modulated is an upper part of the audiobandwidth. The modulating step may include modulating the controlsignals in a modulation mode selected from the group consisting offrequency modulation, amplitude modulation and pulse modulation. Themethod preferably includes recording the combined control and audiosignals.

The invention also provides an apparatus for recovering multi-mediacontrol signals embedded in audio signals in a video program. Thisapparatus includes a T connection for providing the audio signals withembedded control signals along two paths, a low pass filter in one pathand a high pass filter in the other path, the filters having outputs.One output directs an audio program having filtered-out control signalsto an audio channel, and the other output directs a control signalhaving a filtered-out audio program to a multi-media controller channel.

Typically, the output of the high pass filter directs control signals tothe multi-media controller channel.

In a preferred embodiment the apparatus further includes a multi-mediacontroller having the output with the control signal as a first inputand video signals as a second input and having control means forcontrolling the output of video signals from the multi-media controllerin response to the control signals.

According to yet another aspect, the invention provides a method forrecovering multi-media control signals embedded in audio signals in aprogram. This method includes communicating the combined audio signalswith embedded control signals along two paths, low pass filtering thecombined signals in one path and high pass filtering the combinedsignals in the other path to obtain an audio program having filtered-outcontrol signals and a control signal having a filtered-out audioprogram, directing the audio program having filtered-out control signalsto an audio channel, and directing the control signal having afiltered-out audio program to a multi-media controller channel.Preferably, the high pass filtering step provides the control signalswith filtered-out audio program to be directed to the multi-mediacontroller channel. The method preferably includes providing amulti-media controller having the output with the control signal as afirst input and video signals as a second input and controlling theoutput of video signals from the multi-media controller in response tothe control signals.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be better understood after a reading of the DetailedDescription of the Preferred Embodiments and a review of the drawings inwhich:

FIG. 1 is a functional block diagram of components for encodingaudio/video signals with multi-media controller signals according to afirst embodiment of the invention;

FIG. 2 is a functional block diagram of components for decodingmulti-media controller signals from audio/video signals according to thefirst embodiment;

FIG. 3 is a functional block diagram of components for encodingaudio/video signals with multi-media controller signals according to asecond embodiment;

FIG. 4 is a functional block diagram of components for decodingmulti-media controller signals from audio/video signals according to thesecond embodiment; and

FIG. 5 is an elevation view, partially broken away of a fuel dispenseraccording to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

This invention can be used in any audio/video reproduction system inwhich it is desirable to allow a prerecorded audio/visual program tosimultaneously convey control information to the reproduction mechanismalong with the recorded information. The control information may containthe information required to synchronize multiple, independent mediasources. The information is used by a multi-media controller, whichmanipulates audio and/or video outputs based upon prerecorded orinteractive controls, typically multi-media control signals. Thus, theaudio component's volume or other characteristics could be varied, orthe visual image could be faded out, windowed, or otherwise manipulated.Many other manipulations can also be included, as will be apparent tothose of ordinary skill in the art. This invention is independent of theaudio/video format because the control information can be encoded eitherin the audio or video portion of the program. Further, the audioencoding method allows the use of commercial, standard recording andplayback equipment, easing reproduction problems.

As seen in FIG. 5, a fuel dispenser housing 12 is provided withconventional fuel supply line 28, metering device 30, outlet hose 34 andnozzle 36. The metering device 30 communicates data about the volume offuel dispensed along line 32 to a transaction computer 40, whichdisplays transaction information on displays 38. Dispenser 12 alsoincludes a video display screen 125, preferably an active LCD display,with an adjacent keypad 130, which permits a customer to respond toinquiries from the transaction computer 40 by depressing a key. Theapparatus also includes keypad 42 card reader 22, cash acceptor 24 andreceipt discharge 26. The present invention enhances the displaysavailable to be shown on the screen 125, by providing the ability toembed multi-media control signals on a recording to be played on thescreen 125. The apparatus permits the control signals to be recovered toenable a multi-media controller to enhance the display to the customer.Two specific examples of ways to embed and recover the control signalswill now be described:

Video Encoding

Should the format consist of composite video (which does not include anaudio signal), the control information can be embedded an unusedhorizontal line of a video frame, which contains no displayedinformation. Additional circuitry detects the control information andpasses the information on to the multi-media controller of thereproduction mechanism, which then acts upon that information to switchvarious signal sources in and out, or otherwise perform as directed inthe control information.

A block diagram of a circuit to encode the control information in thevideo signal is shown in FIG. 1. For this example, the controlinformation is embedded in the first horizontal line of an interlacedcomposite video signal. The original video program 101 is directed intoa sync separator circuit 107 designed to detect the horizontal syncpulse 102, and a start of first frame signal 103. The start of firstframe signal causes the normal video signal to be switched out by RSlatch 105 and switch 108 and is replaced with the control information104. The start of frame signal inputs a signal to set the latch tooutput a Q value from the latch. The horizontal synch signal resets thelatch to halt outputting the Q value. The Q value is applied to theswitch 108, which acts to route the multi-media control signals to acommon output when the latch outputs the Q value. The switch routes thevideo signal to the common output when the latch does not output the Qvalue. Of course, the reverse latch arrangement in which thestart-of-frame signal is a reset and the horizontal synch signal is theset can readily be implemented by those of ordinary skill in the art.

The embodiment shown in FIG. 1 causes the multi-media control signal tobe recorded in the first horizontal line after the start-of-framesignal, but the invention is not so limited. There are typically 20 orso unused lines, and the circuit may include delays or counters tochoose a different line or lines in which to embed the multi-mediacontrol signals. Also, the horizontal synch signal used to redirect theprogram signal to the output need not be the first one encountered.

The first frame signal is also used to trigger the control signal'ssynchronizing circuit 106 which may be required depending on the type ofcontrol signal format selected. The control signal format may be assimple as a single pulse, a series of pulses, or a digital signal in afrequency modulated or amplitude modulated format. At the firsthorizontal sync, the RS latch is reset and normal video resumes.

In the embodiment depicted in FIG. 1, the combined video and controlsignals are recorded on a recorder 109, such as a video cassetterecorder, a video disk, or any other suitable recording medium.

An almost identical circuit, shown in FIG. 2, may be used to recover thecontrol information. A video signal player 219 is provided playing arecorded video signal with embedded control signals. Of course, thesignals need not be taken from a recording, but could be communicated inany suitable video signal transmission fashion. The embedded videoprogram 201 is directed into a sync separator circuit 207 designed todetect the horizontal sync pulse 202 and the start of first frame 203.The start of first frame signal causes RS latch 205 to output a ControlSignal Prompt 204 to the Control Signal Decoder 206. The output of theControl Signal Decoder, the decoded embedded control signal 216, isrouted to the multi-media controller 208, allowing the controller tosynchronize with the pre-recorded video program supplied directly to it.The multi-media controller 208 may also receive inputs from otherprogram sources, such as a computer data source 212 or other signals214. The controller acts under the direction of the control signaloutput of the control signal decoder to direct selected (or combined)ones of the program signals to the media display 210, which may be atelevision or the like.

Audio Encoding

Should the media format include audio, the control information may becontained in an existing subset of the audio frequency band allotted forthat media. This requires audio signal filtering to ensure that controlsignals and standard audio signals do not cross outside their allottedfrequency bands. A circuit within the reproduction mechanism is tuned tothe control signal band and detects the control signals and passes themon to the reproduction mechanism. The control signal format could be assimple as a single tone, a series of pulsed tones, or a digital signalin a frequency modulated or amplitude modulated format.

A block diagram of a circuit to embed the control information into theaudio frequency band is shown in FIG. 3. For this example, the controlinformation is embedded in the upper portion of the audio frequencyband. The audio program 301 is routed into low pass filter 302 in orderto eliminate its high frequency content. The control signal input 303 ismodulated into the upper portion of the band by modulator 304, using oneof the formats discussed in the previous paragraph. The controlinformation is then added to the low frequency audio by summing thesignals in a conventional summing circuit 305. The summed audio program306 is then passed on to a standard recording mechanism 307.

A block diagram of a circuit for detecting control information embeddedin the upper portion of the audio frequency band is shown in FIG. 4. Forthis example, it is assumed that the audio and video information havealready been separated, if required. The embedded audio program 401 isrouted from a standard playback mechanism 400 or other video signalsource into a signal separator or T 402. Low pass filter 403 thenseparates the audio program 404 which is routed to a conventional audioamplifier 405, if required.

High pass filter 406 separates the control information 407, which isrouted to the control signal detector 408, which detects, demodulatesand/or decodes the control information. The decoded information is sentto the multi-media controller 409, allowing the controller tosynchronize with the pre-recorded audio program.

The multi-media controller 409 may also receive inputs from otherprogram sources, such as a computer data source 412 or other signals414. The controller acts under the direction of the control signaloutput of the control signal detector 408 to direct selected (orcombined) ones of the program signals to the media display 410, whichmay be a television or the like.

This audio encoding method would be required if the normally unusedhorizontal lines be in use so that the video encoding method is notavailable, or the particular format not employ raster scanning, such astransparent film projection, or audio only formats.

Because the control information resides in an existing subset of theaudio band, the many potential problems are avoided in the merging ofthe additional information with the program, and later, with thereproduction of the combined program. The control information can beencoded in almost any current art form, such as Frequency Modulation,Amplitude Modulation, and pulse modulation.

A particularly preferred implementation of this invention is in theGraphic Multiline Display System under development by Glibarco, Inc. ofGreensboro, N.C., assignee of this application. That product combinescomputer generated graphics with pre-recorded audio and videoinformation. This invention enhances the quality of the display byadding control information to the audio portion of the recording, thusallowing for the smooth integration of computer graphics withprerecorded audio and video.

The invention is specifically designed to be used in conjunction withthe inventions described in Glibarco, Inc.'s copending applicationsentitled "Video Display Control" of Hans Atchley, Ser. No. 08/271,553,filed on Jul. 7, 1994, a file wrapper continuation of Ser. No.07/960,515, filed Oct. 13, 1992, and "Multi-media Graphics in FuelDispensers" of Russel Dean Leatherman and Walter Baker, Ser. No.07/960,512, filed Oct. 13, 1992, both filed on even date herewith. Thedisclosures of those two applications are hereby incorporated herein byreference.

Those of ordinary skill in the art will recognize that the invention asdisclosed herein may be implemented in numerous embodiments which differfrom the specific disclosure hereof. All such embodiments which fallwithin the scope of the appended claims are deemed to be within thescope of the patent.

What is claimed is:
 1. An apparatus for encoding multi-media controlsignals into video program signals in a video program comprisingdetectormeans for detecting predetermined portions of the video program signalsand substitution means for substituting the multi-media control signalsconfigured to be used to ascertain when to select the video program intothe video program signals in place of the predetermined portions of thevideo program signals.
 2. An apparatus as claimed in claim 1 whereinsaid program signals are video signals and said detector means is asynchronization separator to separate start-of-frame signals from thevideo signals and said substitution means is a switching means forswitching the control signals into the video signals after detection ofa start-of-frame signal.
 3. An apparatus as claimed in claim 2 whereinsaid synchronization separator also separates a horizontalsynchronization signal from the video signals and said switching meansstops switching the control signals into the video signals when thehorizontal synchronization signal is detected.
 4. An apparatus asclaimed in claim 3 wherein said switching means stops switching thecontrol signals into the video signals when a first horizontalsynchronization signal is detected after the start-of-frame signal. 5.An apparatus as claimed in claim 2 further comprising a control signalsynchronizer to synchronize the control signals with the video signalsupon detection of the start-of-frame signal.
 6. An apparatus as claimedin claim 2 whereinsaid synchronization separator also separates ahorizontal synchronization signal from the video signals and saidswitching means includes a latch having the start of frame signal inputfrom the synchronization separator as one of a set and reset input andthe horizontal synchronization signal as the other of a set and resetinput a switch having a signal routing controlled by said latch, wherebysaid switching means stops switching the control signals into the videosignals when the horizontal synchronization signal is detected.
 7. Anapparatus as claimed in claim 2 wherein the video signals is a compositevideo signal.
 8. An apparatus as claimed in claim 2 further comprising avideo cassette recorder coupled to said substitution means for recordingthe multi-media control signals and the video signals in combination. 9.An apparatus for encoding multi-media control signals into video signalsin a video program comprisinga synchronization separator to separatestart-of-frame signals from the video signals and a horizontalsynchronization signal from the video signals, a control signalsynchronizer to synchronize the control signals configured to be used toascertain when to select the video program with the video signals upondetection of a start-of-frame signal, a latch having the start-of-framesignals input from said synchronization separator as one of a set and areset input and the horizontal synchronization signal as the other of aset and a reset input, a switch having the video signals and the controlsignals as inputs and an output signal routing controlled by said latch,and a video signal recorder having the output of said switch as aninput, whereby said switch switches the control signals into the videosignals when one of said start-of-frame signals is detected and stopsswitching the control signals into the video signals when the horizontalsynchronization signal is detected, and the video signal recorderrecords the video signals with embedded control signals.
 10. Anapparatus for recovering multi-media control signals embedded in videoprogram signals in a video program comprisingdetector means fordetecting predetermined portions of the video program signals having theembedded control signals and rerouting means for rerouting the controlsignals configured to be used to ascertain when to select the videoprogram in the video program signals to an output adapted for attachmentto a multi-media controller to act on the video program signals asdirected to a media display.
 11. An apparatus as claimed in claim 10wherein the program signals are video signals and said detector means isa synchronization separator to separate start-of-frame signals from thevideo signals and said rerouting means is a gate for routing the controlsignals to said output after a start-of-frame signal is detected.
 12. Anapparatus as claimed in claim 11 wherein said synchronization separatoralso separates a horizontal synchronization signal from the videosignals and said gate stops routing the control signals to said outputwhen the horizontal synchronization signal is detected.
 13. An apparatusas claimed in claim 12 wherein said gate stops routing the controlsignals to said output when a first horizontal synchronization signal isdetected after the start-of-frame signal.
 14. An apparatus as claimed inclaim 10 wherein the video signals are a composite video signal.
 15. Anapparatus as claimed in claim 10 wherein said multi-media controller hassaid output as a first input and video signals as a second input andcontrol means for controlling the output of the video signals from saidmulti-media controller in response to the control signals.
 16. Amulti-media apparatus for use with multi-media control signals embeddedin composite video signals in a video program comprisingasynchronization separator to separate a start-of-frame signal and ahorizontal synchronization signal from the video signals, a gate forrouting the control signals configured to be used to ascertain when toselect the video program to a multi-media controller to act on the videosignals as directed to a media display when the start-of-frame signal isdetected until a selected horizontal synchronization signal is detected,said multi-media controller having the control signals and the videosignals as separate inputs and control means for controlling the outputof the video signals from said multi-media controlled in response to thecontrol signals.
 17. A multi-media apparatus for use with multi-mediacontrol signals embedded in audio signals in a video program comprisingaT connection for providing along two paths the audio signals havingembedded control signals configured to be used to ascertain when toselect the video program, a low pass filter in one path directing anaudio program having filtered-out control signals to an audio channeland a high pass filter in the other path directing a control signalhaving a filtered-out audio program to a control signal channel, and amulti-media controller having an output, the control signal channel as afirst input and the video program as a second input and having controlmeans for controlling the output of the video program from saidmulti-media controller in response to the control signals.
 18. A methodof encoding multi-media control signals into video program signals in avideo program comprisingdetecting predetermined portions of the videoprogram signals and substituting the multi-media control signalsconfigured to be used to ascertain when to select the video program intothe video program signals in place of the predetermined video programsignals.
 19. A method as claimed in claim 18 wherein the program signalsare video signals and the detecting step separates start-of-framesignals from the video signals and said substituting step switches thecontrol signals into the video signals after a start-of-frame signal isdetected.
 20. A method as claimed in claim 19 wherein said separatingstep includes separating a horizontal synchronization signal from thevideo signals and said switching step terminates when the horizontalsynchronization signal is detected.
 21. A method as claimed in claim 20wherein said switching step terminates when a first horizontalsynchronization signal is detected after the start-of-frame signal. 22.A method as claimed in claim 20 further comprising synchronizing thecontrol signals with the video signals upon detection of thestart-of-frame signal.
 23. A method as claimed in claim 20 whereinsaidswitching step includesone of setting a latch or resetting the latchwhen the start of frame signal is detected in the detecting step tooutput a signal level from the latch and the other of setting orresetting the latch when the horizontal synchronization signal isdetected in said detecting step to halt outputting the signal level, andsaid switching step includes routing the multi-media control signals toa common output when the latch outputs the signal level and routing thevideo signals to the common output when the latch does not output thesignal level.
 24. A method as claimed in claim 19 wherein the videosignals is a composite video signal.
 25. A method as claimed in claim 19further comprising recording the multi-media control signals and thevideo signals in combination on a video cassette recorder.
 26. A methodof encoding multi-media control signals into composite video signals ina video program comprisingdetecting start-of-frame signals in the videosignals, synchronizing the control signals configured to be used toascertain when to select the video program with the video signals upondetection of the start-of-frame signals, detecting a horizontalsynchronization signal in the video signals, substituting themulti-media control signals into the video signals after one of thestart-of-frame signals is detected until one of the horizontalsynchronization signals is detected, and recording the multi-mediacontrol signals and video signals in combination on a video cassetterecorder.
 27. A method for controlling a multi-media display withcontrol signals embedded in composite video signals in a video programcomprisingproviding a multi-media controller having a first input forcontrol signals and a second input for video signals, separatingstart-of-frame signals from the video signals, separating horizontalsynchronization signals from the video signals, rerouting the controlsignals in the video signals to the multi-media controller by gating thecontrol signals to the output after a start-of-frame signal is detecteduntil a horizontal synchronization signal is detected, and controllingthe output of the video signals from the multi-media controller inresponse to the control signals.
 28. A method for controlling amulti-media display with control signals embedded in audio signals in avideo program comprisingproviding a multi-media controller, supplyingvideo program signals to the multi-media controller, high pass filteringthe audio signals with the embedded control signals to obtain a controlsignal having the audio signals filtered-out, directing the controlsignal to the multi-media controller and controlling the output of videosignals from the multi-media controller in response to the controlsignals.